Trek Summer Clearance Sale

The All-New Trek Domane

The bike that makes every road ride better.

Road Bike

Glass Slipper
Shoe Sale

Mountain Bike

Bicycle Blue Book - Athorized Trade-In Partner


What's New?

Is it New Bike Time? Always!
08/01/19- Don't waste another nice day on impulse power when you could be riding at Warp 9. Chain Reaction features the very best bikes from Trek & Electra, as well as the highest-quality travel bikes from Bike Friday. Road, Mountain, Hybrid, Electric assist, Kids... we've got them all. Probably the best selection in a single location you'll find anywhere on the peninsula too.

Got a bike that needs repairs?
If you purchased your bike from us, remember that you can bring it in anytime, without calling ahead, for minor on-the-spot adjustments of brakes, gears and wheels (at no charge; this is included with any bike purchased from us). For flat tires, again, no appointment needed. Where possible we try and do flat tires while you wait, but there will be times that's not possible. At most you will be leaving your bike overnight.

For normal (bigger) repairs, our backlog has become so bad that, for the remainder of July, we can no longer take in major work. It is literally a "no room at the inn" situation. This could be the case at many shops known for high-quality service. Not helping matters has been the demise of several local bike shops (the most recent of which is Talbots Cyclery in San Mateo, and several Performance stores), which adds to the strain the remaining shops are feeling.
Shock servicing: Presently we send forks & rear shocks out for servicing; it generally takes 2-3 weeks and runs about $260 for a fork rebuild, slightly less for most rear shocks. We don't recommend servicing any shock over 8 years old.
Hydraulic brake servicing: We no longer bleed or repair hydraulic brake systems more than 8 years old. The results are generally unacceptable and the cost of a replacement brake, which includes pads, isn't that much higher.
It's E-Bike time at Chain Reaction! E-Bikes are the latest thing; find out why! Commute to the office without needing a shower, bring home the groceries (even if you live on top of a hill!) or keep up with your obsessive-cyclist partner. Prices start at just $1299 (Oyama folding E-bike) up to the incredible Trek Super Commuter 8 at $5199. They're not a secret anymore; everyone seems to have one. Find out why!

Disc Brakes for Road Bikes- Making the right choice

Disc brakes are the latest thing for road bikes. But are they the right choice for you? We discuss the trade-offs including benefits, cost, added weight and maintenance requirements.

Just a few of the bikes we sell. One of them is just right for you!

Bike Friday Pocket Companion Osata (Folding version)
$749.99 - $799.99 $944.00 - $999.00 Up To 25% Savings
Across town or across the continent, Bike Friday's Pocket Companion OSATA (...
Trek FX 2
$499.99 - $549.99 $539.99 - $549.99 Up To 9% Savings
Fitness, simplified FX offers a best-of-both-worlds combination of road ...
Trek Checkpoint AL 4
$1,469.99 - $1,539.99 $1,539.99 Up To 5% Savings
Checkpoint AL 4 is an ideal entry point to the world of gravel riding. It's...
Trek Domane SL 7 Disc
$5,399.99 - $5,779.99 $5,779.99 Up To 7% Savings
Domane SL 7 Disc is a high-performance endurance road bike with an electron...
Trek Checkpoint AL 3
$1,149.99 - $1,199.99 $1,199.99 Up To 4% Savings
Checkpoint AL 3 may be the introductory gravel bike in the lineup, but it's...
Electra Loft Go! 8i Step-Thru
$2,399.99 - $2,799.99 $2,799.99 Up To 14% Savings
Go! uptown. Go! downtown. Go! out of town. The Loft Go! is the perfect urba...
Trek Dual Sport 3
$749.99 - $809.99 $799.99 - $809.99 Up To 7% Savings
Dual Sport 3 is a high-performance hybrid bike with upgraded components tha...
Trek 920 Disc
$1,349.99 $1,989.99 32% Savings
Expand beyond the roads on your next bicycle tour. Trek's 920 features a li...
Trek Verve+
$1,899.99 $2,399.99 21% Savings
Verve+ is an electric hybrid bike designed for comfort on commutes, daily c...
Trek Marlin 5
$499.99 - $549.99 $539.99 - $549.99 Up To 9% Savings
Marlin 5 is a trail-worthy daily rider that's perfectly suited for everyday...
Trek Domane SL 5 Women's
$1,999.99 - $2,299.99 $2,299.99 Up To 13% Savings
Domane SL 5 Women's is all about smooth riding, speed, and efficiency. It's...
Trek Powerfly 8 FS Plus
$3,999.99 $4,999.99 20% Savings
Powerfly builds on its success with a new full suspension lineup that borro...